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| − | The next sections outline a way to develop a Rich UI application. The IDE helps you to do the tasks quickly.
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| − | For background information, see [http://www.eclipse.org/edt/papers/topics/egl_web_technology.html Web technology for EGL Rich UI].
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| − | = Create a Handler type of stereotype RUIHandler =
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| − | Consider a grid layout on the design surface and the related code:
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| − | [[Image:Gridlayout initial design.jpg]]
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| − | <source lang="java">
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| − | package client;
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| − | import org.eclipse.edt.rui.widgets.GridLayout;
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| − | handler MyHandler type RUIhandler{
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| − | // sets one or more widgets at the root of the widget tree.
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| − | initialUI =[ui],
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| − | // specifies the function that runs initially and without user interaction.
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| − | onConstructionFunction = start,
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| − | // identifies the CSS file that helps you to design the page.
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| − | cssFile = "css/MyProject.css",
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| − | // sets the title that is displayed at the top of your browser or browser tab.
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| − | title = "MyHandler"}
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| − | ui GridLayout{columns = 3, rows = 4, cellPadding = 4, children =[]};
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| − | function start()
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| − | end
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| − | end
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| − | </source>
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| − | When you request a Rich UI handler, the Rich UI editor includes a grid layout of 3 columns and 4 rows.
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| − |
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| − | = Declare and display a set of widgets =
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| − | The grid layout now has four widgets in the first two columns:
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| − | [[Image:Gridlayout without spanning design.jpg]]
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| − | The third column is present, but empty. <br>
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| − | Here is the preview and the code that created it:
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| − | [[Image:Gridlayout without spanning.jpg]]
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| − | <source lang="java">
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| − | package client;
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| − | import org.eclipse.edt.rui.widgets.Button;
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| − | import org.eclipse.edt.rui.widgets.CheckBox;
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| − | import org.eclipse.edt.rui.widgets.GridLayout;
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| − | import org.eclipse.edt.rui.widgets.GridLayoutData;
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| − | import org.eclipse.edt.rui.widgets.GridLayoutLib;
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| − | import org.eclipse.edt.rui.widgets.TextField;
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| − | import org.eclipse.edt.rui.widgets.TextLabel;
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| − | import eglx.ui.rui.RUIHandler;
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| − | handler MySecondHandler type RUIhandler{
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| − | initialUI =[ui], onConstructionFunction = start,
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| − | cssFile = "css/MyProject.css", title = "MyHandler"}
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| − |
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| − | ui GridLayout{columns = 3, rows = 4, cellPadding = 4,
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| − | children =[myLabel, myTextField, myCheckBox, myButton]};
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| − | myLabel TextLabel{ layoutData = new GridLayoutData{ row = 1, column=1},
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| − | text = "a label: " };
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| − | myTextField TextField{ layoutData = new GridLayoutData{ row = 1, column = 2},
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| − | text = "a text field"};
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| − | myCheckBox CheckBox{ layoutData = new GridLayoutData{ row = 2, column = 2 },
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| − | text="a check box" };
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| − |
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| − | myButton Button{ layoutData = new GridLayoutData{ row = 4, column = 1 },
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| − | text="a button" };
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| − | function start()
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| − | end
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| − | end
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| − | </source>
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| − | = Customize the display =
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| − | [[Image:Gridlayout spanning design.jpg]]
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| − | <br>
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| − | Now the text field spans columns 2 and 3, and the checkbox spans rows 2 and 3.
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| − | <source lang="java">
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| − | package client;
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| − | import org.eclipse.edt.rui.widgets.Button;
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| − | import org.eclipse.edt.rui.widgets.CheckBox;
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| − | import org.eclipse.edt.rui.widgets.GridLayout;
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| − | import org.eclipse.edt.rui.widgets.GridLayoutData;
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| − | import org.eclipse.edt.rui.widgets.GridLayoutLib;
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| − | import org.eclipse.edt.rui.widgets.TextField;
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| − | import org.eclipse.edt.rui.widgets.TextLabel;
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| − | import eglx.ui.rui.RUIHandler;
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| − |
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| − | handler MyHandler type RUIhandler{
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| − | initialUI =[ui], onConstructionFunction = start,
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| − | cssFile = "css/MyProject.css", title = "MyHandler"}
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| − |
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| − | ui GridLayout{columns = 3, rows = 4, cellPadding = 4,
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| − | children =[myLabel, myTextField, myCheckBox, myButton]};
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| − | myLabel TextLabel{ layoutData = new GridLayoutData{ row = 1, column=1},
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| − | text = "a label: " };
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| − |
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| − | myTextField TextField{ layoutData = new GridLayoutData{ row = 1, column = 2,
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| − | horizontalSpan = 2 }, text = "a text field"};
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| − | myCheckBox CheckBox{ layoutData = new GridLayoutData{ row = 2, column = 2,
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| − | verticalSpan = 2 }, text="a check box" };
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| − | myButton Button{ layoutData = new GridLayoutData{ row = 4, column = 1,
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| − | horizontalSpan = 2,
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| − | horizontalAlignment = GridLayoutLib.Align_Center },
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| − | text="a button" };
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| − | function start()
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| − | end
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| − | end
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| − |
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| − | </source>
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| − | <br>
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| − | <br>
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| − | <br>
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| − | = Assign and code event handlers =
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| − | <source lang="java">
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| − | </source>
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| − |
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| − | = Write the on-construction function =
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| − | <source lang="java">
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| − | </source>
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| − | <br> <br> <br><br> ♦ [[EDT:Code snippets|Code snippets main page]] <br>
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| − |
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| − | [[Category:EDT]]
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